The Transpose Of Matrix Sum: Proof That (A+B)T = At + Bt

The transpose of a sum of matrices equals the sum of their transposes.

True according to Theorem 3B which says that the transpose of a sum of matrices equals the sum of their transposes.

The transpose of a matrix is found by interchanging its rows and columns. So, if we have two matrices A and B, and C is their sum, then their transpose can be defined as follows:

Transpose of A: (AT)ij = Aji
Transpose of B: (BT)ij = Bji

Now, let’s consider the transpose of their sum:

(CT)ij = Cji

Where Cij = Aij + Bij

We can now see that:

(CT)ij = Cji = (Aij + Bij)T = Aji + Bji = (AT)ij + (BT)ij

Therefore, we just proved that the transpose of a sum of matrices equals the sum of their transposes.

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